JP2020195000A - In-vehicle amplifier device - Google Patents

Abstract

To provide an in-vehicle amplifier device 100 capable of improving sound image localization in all seats in a vehicle 1.SOLUTION: An in-vehicle amplifier device 100 includes a first amplifier 101 that amplifies a right side signal of a stereo signal and outputs the amplified right side signal to a right front speaker 11, a second amplifier 102 that amplifies a left side signal of the stereo signal and outputs the amplified left side signal to a left front speaker 12, a first addition circuit 111 that combines the right side signal of the stereo signal and the left side signal of the stereo signal to generate a monaural signal, and outputs the generated monaural signal as a first addition signal, a third amplifier 103 that amplifies the input first addition signal and outputs the amplified first addition signal to a right rear speaker 13 and a left rear speaker 14, and a fourth amplifier 104 that amplifies the input first addition signal and outputs the amplified first addition signal to a center speaker 15.SELECTED DRAWING: Figure 2

Description

The present invention relates to an in-vehicle amplifier device.

An in-vehicle sound system generally includes four speakers, a front right speaker and a rear right speaker that output a right side signal among stereo signals, and a front left speaker and a rear left speaker that output a left side signal among stereo signals. Is the target. Further, in order to output sound from each of the four speakers, the in-vehicle sound system is generally provided with an in-vehicle amplifier device having four amplifiers as amplifiers corresponding to each of the four speakers. Is. In the conventional in-vehicle sound system, the in-vehicle amplifier device adjusts the amplification value or the delay amount of each of the four amplifiers of the in-vehicle amplifier device, so that the sound output from each of the four speakers is output. Is set so that the sound image localization in the driver's seat is good.

Further, in addition to the above four speakers, a center speaker is arranged between the right front speaker and the left front speaker, the right front signal is connected to the right front speaker, the left front signal is connected to the left front speaker, and the center speaker is connected. By connecting a monaural signal which is an addition signal of the right side signal and the left side signal to, and connecting a monaural signal which is a difference signal between the right side signal and the left side signal to the right rear speaker and the left rear speaker, four pieces are connected. There is an in-vehicle acoustic system that outputs sound from five speakers using an amplifier (Patent Document 1).

Japanese Patent Application Laid-Open No. 03-07798

When the right rear signal is output from the right rear speaker and the left signal is output from the left rear speaker, the sound image localization in the rear seat is dominated by the sound output from the right rear speaker or the left rear speaker near the rear seat. Therefore, the bass range is small and the midrange and treble range are large. Therefore, in this case, there is a problem that the sound image localization in the rear seat is not good.

The present invention is for solving the above-mentioned problems, and an object of the present invention is to provide an in-vehicle amplifier device capable of improving sound image localization in all seats in a vehicle.

The in-vehicle amplifier device according to the present invention has a first amplifier that amplifies the right side signal of the stereo signal and outputs the amplified right side signal as the right side output signal to the right front speaker mounted on the vehicle 1 and a stereo signal. The left side signal is amplified, and the left side signal after amplification is used as the left side output signal, and the second amplifier that outputs to the left front speaker mounted on the vehicle 1, the right side signal of the stereo signal, and the left side signal of the stereo signal are added. A first adder circuit that generates a monaural signal and outputs the generated monaural signal as a first add-on signal, and a first add-on output that amplifies the input first add-on signal and outputs the amplified first add-on signal. As signals, the third amplifier that outputs to the right rear speaker and the left rear speaker mounted on the vehicle 1, and the input first addition signal are amplified, and the amplified first addition signal is used as the second addition output signal. As a result, a fourth amplifier that outputs to the center speaker mounted on the vehicle 1 is provided.

According to the present invention, sound image localization can be improved in all seats in a vehicle.

FIG. 1 is a block diagram showing an example of a main part of a configuration of an in-vehicle audio system to which the in-vehicle amplifier device according to the first embodiment is applied. FIG. 2 is a block diagram showing an example of a main part of the configuration of the in-vehicle amplifier device according to the first embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1.
With reference to FIG. 1, the configuration of the vehicle-mounted audio system 10 to which the vehicle-mounted amplifier device 100 according to the first embodiment is applied will be described.
The vehicle-mounted amplifier device 100 according to the first embodiment will be described below, as an example, as being applied to the vehicle-mounted audio system 10 mounted on the vehicle 1.
FIG. 1 is a block diagram showing an example of a main part of the configuration of the vehicle-mounted audio system 10 to which the vehicle-mounted amplifier device 100 according to the first embodiment is applied.
The in-vehicle sound system 10 includes a right front speaker 11, a left front speaker 12, a right rear speaker 13, a left rear speaker 14, a center speaker 15, a reproduction device 16, and an in-vehicle amplifier device 100.

The right front speaker 11 is a speaker arranged on the right front inside the vehicle 1.
The left front speaker 12 is a speaker arranged on the left front inside the vehicle 1.
The right rear speaker 13 is a speaker arranged on the right rear side inside the vehicle 1.
The left rear speaker 14 is a speaker arranged on the left rear inside the vehicle 1.
The center speaker 15 is a speaker arranged in front of the inside of the vehicle 1. Specifically, for example, the center speaker 15 is arranged between the right front speaker 11 and the left front speaker 12 inside the vehicle 1.

The playback device 16 outputs an audio signal. The playback device 16 is, for example, an audio stored in a storage medium such as a CD (Compact Disc), a DVD (Digital Versaille Disc), an HDD (Hard Disk Drive), a USB (Universal Serial Bus) flash drive, or an SD memory card. The data is decoded, and the decoded audio data is output as an audio signal. Further, for example, the playback device 16 may demodulate the received radio wave of FM radio broadcast or AM radio broadcast, and output the demodulated radio wave as an audio signal.
In the following description, the audio signal output by the reproduction device 16 will be described as being a stereo signal having a right side signal and a left side signal.
The audio signal output by the reproduction device 16 is input to the in-vehicle amplifier device 100.

The in-vehicle amplifier device 100 is connected to each of the right front speaker 11, the left front speaker 12, the right rear speaker 13, the left rear speaker 14, and the center speaker 15.
The in-vehicle amplifier device 100 receives a stereo signal, which is an audio signal output by the reproduction device 16, and receives audio from each of the right front speaker 11, the left front speaker 12, the right rear speaker 13, the left rear speaker 14, and the center speaker 15. The output signal for output is output to each of the right front speaker 11, the left front speaker 12, the right rear speaker 13, the left rear speaker 14, and the center speaker 15.
The configuration of the in-vehicle amplifier device 100 according to the first embodiment will be described with reference to FIG.
FIG. 2 is a block diagram showing an example of a main part of the configuration of the in-vehicle amplifier device 100 according to the first embodiment.

The in-vehicle amplifier device 100 includes a first amplifier 101, a second amplifier 102, a third amplifier 103, a fourth amplifier 104, and a first adder circuit 111.
In addition to the above configuration, the in-vehicle amplifier device 100 includes a connection line 106, a first delay circuit 121, a second delay circuit 122, a separation circuit 131, a second adder circuit 112, a first subtraction circuit 141, and a second subtraction circuit. It may be provided with 142, a first attenuation circuit 151, a third addition circuit 113, a third delay circuit 123, a second attenuation circuit 152, a fourth addition circuit 114, and the like.
Further, the in-vehicle amplifier device 100 may include an equalizer 171, 172, 173, 174 configured by an IIR (Infinite Impulse Response) filter, a filter such as an FIR (Fiinite Impulse Response) filter, or the like. good.

As an example, the in-vehicle amplifier device 100 according to the first embodiment has a first amplifier 101, a second amplifier 102, a third amplifier 103, a fourth amplifier 104, a first addition circuit 111, a connection line 106, and a first delay circuit. 121, 2nd delay circuit 122, separation circuit 131, 2nd adder circuit 112, 2nd subtraction circuit 142, 1st attenuation circuit 151, 3rd adder circuit 113, 3rd delay circuit 123, 2nd attenuation circuit 152, 4th It will be described as including the adder circuit 114 and the equalizers 171, 172, 173, and 174.

The first amplifier 101 amplifies the right side signal of the stereo signal. The first amplifier 101 outputs the amplified right side signal as a right side output signal to the right front speaker 11 mounted on the vehicle 1.
The second amplifier 102 amplifies the left side signal of the stereo signal. The second amplifier 102 outputs the amplified left side signal as a left side output signal to the left front speaker 12 mounted on the vehicle 1.
The first addition circuit 111 adds the right side signal of the stereo signal and the left side signal of the stereo signal to generate a monaural signal. The first addition circuit 111 outputs the generated monaural signal as the first addition signal.
The third amplifier 103 amplifies the input first addition signal. The third amplifier 103 outputs the amplified first addition signal as the first addition output signal to the right rear speaker 13 and the left rear speaker 14 mounted on the vehicle 1.
The fourth amplifier 104 amplifies the input first addition signal. The fourth amplifier 104 outputs the amplified first addition signal as the second addition output signal to the center speaker 15 mounted on the vehicle 1.

With this configuration, the sound output from the center speaker 15 becomes a monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal. Further, the sound output from the right rear speaker 13 and the left rear speaker 14 is a monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal. The monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal is compared with the difference signal between the right side signal of the stereo signal and the left side signal of the stereo signal, and is in the frequency band such as a human singing voice. It includes a lot of corresponding midrange.
When the sound output from the right rear speaker 13 and the left rear speaker 14 is a monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal, the right rear speaker 13 and the left rear speaker 14 The midrange corresponding to the frequency band such as a human singing voice can be floated and floated in the region between them, and the sound image can be suppressed from sticking to the right rear speaker 13 or the left rear speaker 14 in the rear seat.

When the monaural sound is simultaneously output from the center speaker 15, the right rear speaker 13, and the left rear speaker 14, the monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal is a human singing voice or the like. Since it contains a lot of midrange corresponding to the frequency band of, the sound heard in the front seat is localized forward as if singing in front of the eyes.
Therefore, the sound image localization in the front seat is good.

Further, in the rear seats, since the sound including a large amount of the midrange is output from the center speaker 15, the sound in the midrange can be clearly localized in front of or above the rear seat.
Therefore, in the rear seats, it sounds as if a person is uttering a voice in front of the eyes, so that the sound image localization in the rear seats is good.
That is, by configuring as described above, the sound image localization in all seats becomes good.

The in-vehicle amplifier device 100 may include an equalizer 171, 172, 173, 174.
The equalizer 171 is a circuit for changing the frequency characteristic of the right side signal of the stereo signal amplified by the first amplifier 101. That is, the equalizer 171 changes the sound quality of the sound output from the right front speaker 11 to a desired sound quality.
When the in-vehicle amplifier device 100 includes the equalizer 171, the first amplifier 101 amplifies the right side signal of the stereo signal after changing the frequency characteristics output by the equalizer 171.
The equalizer 172 is a circuit for changing the frequency characteristic of the left side signal of the stereo signal amplified by the second amplifier 102. That is, the equalizer 172 changes the sound quality of the sound output from the left front speaker 12 to a desired sound quality.
When the in-vehicle amplifier device 100 includes the equalizer 172, the second amplifier 102 amplifies the left side signal of the stereo signal after changing the frequency characteristics output by the equalizer 172.

The equalizer 173 is a circuit for changing the frequency characteristic of the first addition signal amplified by the third amplifier 103. That is, the equalizer 173 changes the sound quality of the sound output from the right rear speaker 13 and the left rear speaker 14 to a desired sound quality.
When the in-vehicle amplifier device 100 includes the equalizer 173, the third amplifier 103 amplifies the first addition signal after changing the frequency characteristics output by the equalizer 173.

The equalizer 174 is a circuit for changing the frequency characteristic of the first addition signal amplified by the fourth amplifier 104. That is, the equalizer 174 changes the sound quality of the sound output from the center speaker 15 to a desired sound quality.
When the in-vehicle amplifier device 100 includes the equalizer 174, the fourth amplifier 104 amplifies the first addition signal after changing the frequency characteristics output by the equalizer 174.

The in-vehicle amplifier device 100 may include a connection line 106 in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111. good.
The connection line 106 is a line for connecting the right rear speaker 13 and the left rear speaker 14 in series.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the connection line 106, the third amplifier 103 is connected in series to the right rear speaker 13 and the left rear speaker 14 via the connection line 106.

Since the in-vehicle speaker has a predetermined resistance value such as 4Ω (ohm), the strength of the sound output from the right rear speaker 13 and the left rear speaker 14 is increased by this configuration. The total is about 6 dB (decibel) smaller than the strength of the sound output from the center speaker 15.
Therefore, since the voice from the front is heard louder than the voice from the rear, the voice heard in the front seat is localized in the front as if singing in front of the eyes. In particular, the monaural sound to which the right side signal of the stereo signal and the left side signal of the stereo signal are added contains a lot of midrange corresponding to the frequency band such as human singing voice, so the sound heard in the front seat is in front of you. Localize forward as if singing in. Therefore, in the front seat, the sound image localization in the front seat is good.
Further, in the rear seat, the sound including a large range in the middle range is output from the center speaker 15, and the volume of the sound output from the right rear speaker 13 and the left rear speaker 14 is the sound output from the center speaker 15. Since the volume is low compared to the volume, the sound in the midrange can be clearly localized in front of or above the rear seat. Therefore, in the rear seats, it sounds as if a person is speaking in front of or in front of the eyes, so that the sound image localization in the rear seats is good.
That is, by configuring as described above, the sound image localization in all seats becomes good.

The in-vehicle amplifier device 100 includes a first delay circuit 121 in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111. You may.
The first delay circuit 121 delays the input first addition signal by a first predetermined period with respect to the right side signal amplified by the first amplifier 101 or the left side signal amplified by the second amplifier 102.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the first delay circuit 121, the third amplifier 103 amplifies the first addition signal after the first delay circuit 121 delays by the first predetermined period. Configure to do. The first predetermined period is a predetermined period such as 15 milliseconds. 15 ms is only an example, and the first predetermined period may be longer than 15 ms or shorter than 15 ms.
When the driver's seat is on the right side in the direction in which the vehicle 1 advances, as shown in FIG. 1, for example, the first delay circuit 121 has only the first predetermined period with respect to the sound output from the right front speaker 11. The first addition signal is delayed by a first predetermined period with respect to the right signal amplified by the first amplifier 101 so that the delayed sound is output from the right rear speaker 13 and the left rear speaker 14. The first delay circuit 121 is a first addition signal with respect to the left signal amplified by the second amplifier 102 when the driver's seat is on the right side in the direction in which the vehicle 1 moves forward, as shown in FIG. May be delayed by the first predetermined period.

With this configuration, the sound output from the right rear speaker 13 and the left rear speaker 14 is delayed by a minute period from the sound output from the reference speaker. When the sounds output from the two speakers are deviated by a minute period, the position of the sound image localization formed between the two speakers can be moved. Therefore, the sound output from the right rear speaker 13 and the left rear speaker 14 is delayed by a minute period from the sound output from the reference speaker, so that the sound heard in all seats is in front of the eyes. Localize forward as if singing.
In particular, the monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal includes a large amount of midrange corresponding to the frequency band such as human singing voice, so that the sound heard in all seats is in front of you. Localize forward as if singing.
Therefore, in all the seats, it sounds as if a person is voicing in front, so that the sound image localization in all the seats is good.

Further, in the in-vehicle amplifier device 100, when the driver's seat is on the right side in the direction in which the vehicle 1 moves forward, as shown in FIG. 1, the first amplifier 101 amplifies using a delay circuit (not shown). The right side signal may be configured to be delayed by a predetermined period such as 10 milliseconds with respect to the left side signal amplified by the second amplifier 102. With this configuration, in the driver's seat, the sound output from the right front speaker 11 near the driver's seat and the sound output from the left front speaker 12 are synchronized, and the sound image localization in the driver's seat is good. Become.
For example, the in-vehicle amplifier device 100 is configured so that the right side signal amplified by the first amplifier 101 is delayed by 10 milliseconds with respect to the left side signal amplified by the second amplifier 102, and the third amplifier 103. When the first addition signal amplified by is configured to be delayed by the first delay circuit 121 with respect to the left side signal amplified by the second amplifier 102 by 15 milliseconds, the first addition signal is changed to the right side signal. On the other hand, it can be delayed by only 5 milliseconds.

In the above description, the case where the driver's seat is on the right side in the direction in which the vehicle 1 moves forward has been described, but the same applies to the case where the driver's seat is on the left side in the direction in which the vehicle 1 moves forward. Therefore, the description thereof will be omitted.
Further, in the in-vehicle amplifier device 100 shown in FIG. 1, as an example, the first delay circuit 121 is configured to delay the signal output from the equalizer 173, but this is not the case. For example, the in-vehicle amplifier device 100 may be configured so that the signal output from the first delay circuit 121 can be input to the equalizer 173 and the signal output from the equalizer 173 can be input to the third amplifier 103.

The in-vehicle amplifier device 100 includes a second delay circuit in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, first adder circuit 111, and first delay circuit 121. It may be provided with 122.
The second delay circuit 122 has a second predetermined period shorter than the first predetermined period with respect to the right side signal amplified by the first amplifier 101 or the left side signal amplified by the second amplifier 102 for the input first addition signal. Delay by the period.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the second delay circuit 122, the fourth amplifier 104 amplifies the first addition signal after the second delay circuit 122 delays by a second predetermined period. Configure to do. The second predetermined period is a predetermined period such as 5 milliseconds. 5 milliseconds is only an example, and the second predetermined period may be longer than 5 milliseconds or shorter than 5 milliseconds as long as it is shorter than the first predetermined period.
When the driver's seat is on the right side in the direction in which the vehicle 1 advances as shown in FIG. 1, for example, the second delay circuit 122 has a second predetermined period with respect to the sound output from the right front speaker 11. The first addition signal is delayed by a second predetermined period with respect to the right side signal amplified by the first amplifier 101 so that the delayed sound is output from the center speaker 15.

With this configuration, in the driver's seat, the sound output from the right front speaker 11 near the driver's seat and the sound output from the center speaker 15 are synchronized, and the sound image localization in the driver's seat is good. Become.
Further, since the second predetermined period is shorter than the first predetermined period, the sound output from the right rear speaker 13 and the left rear speaker 14 is delayed by a minute period from the sound output from the center speaker 15. .. The sound output from the right rear speaker 13 and the left rear speaker 14 is delayed by a minute period from the sound output from the center speaker 15, so that the sound heard in all seats is singing in front of the eyes. Localize forward as.
In particular, the monaural sound obtained by adding the right side signal of the stereo signal and the left side signal of the stereo signal includes a large amount of midrange corresponding to the frequency band such as human singing voice, so that the sound heard in all seats is in front of you. Localize forward as if singing.
Therefore, in all the seats, it sounds as if a person is voicing in front, so that the sound image localization in all the seats is good.

The same applies to the case where the driver's seat is on the left side in the direction in which the vehicle 1 moves forward, and thus the description thereof will be omitted.
Further, in the in-vehicle amplifier device 100 shown in FIG. 1, as an example, the second delay circuit 122 is configured to delay the signal output from the equalizer 174, but this is not the case. For example, the in-vehicle amplifier device 100 may be configured so that the signal output from the second delay circuit 122 is input to the equalizer 174 and the signal output from the equalizer 174 is input to the fourth amplifier 104.

The in-vehicle amplifier device 100 includes a separation circuit 131 and a second adder circuit 112 in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111. It may be provided with.
The separation circuit 131 separates the midrange signal from the input first addition signal, generates a separation signal including a part of the separated midrange signal, and outputs the generated separation signal. The separation circuit 131 is composed of, for example, a bandpass filter that passes a midrange signal. Specifically, for example, the separation circuit 131 generates a separation signal by extracting a midrange signal from the first addition signal and attenuating the extracted midrange signal by a predetermined ratio.
The second addition circuit 112 adds the input separation signal to the input first addition signal.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the separation circuit 131 and the second addition circuit 112, the fourth amplifier 104 is the first addition signal after the second addition circuit 112 adds the separation signal. Is configured to amplify.

With this configuration, the sound output from the center speaker 15 has a midrange corresponding to the frequency band such as a human singing voice, as compared with the sound output from the right rear speaker 13 and the left rear speaker 14. The sound has a large proportion of frequency components. Therefore, the midrange corresponding to the frequency band such as a human singing voice can be heard better from the front.
Therefore, in all the seats, it sounds as if a person is voicing in front, so that the sound image localization in all the seats is good.

The in-vehicle amplifier device 100 includes a separation circuit 131 and a first subtraction circuit 141 in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111. It may be provided with.
Since the separation circuit 131 has been described above, the description thereof will be omitted.
The first subtraction circuit 141 subtracts the input separation signal from the input first addition signal.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the separation circuit 131 and the first subtraction circuit 141, the third amplifier 103 is after the first subtraction circuit 141 subtracts the separation signal from the first addition signal. It is configured to amplify the first addition signal of.

With this configuration, the sounds output from the right rear speaker 13 and the left rear speaker 14 are the sounds of musical instruments, sound effects, etc., while retaining the frequency components in the midrange corresponding to the frequency band such as human singing voice. Alternatively, the proportion of frequency components in the treble or bass range corresponding to the frequency band such as environmental sound is increased.
Therefore, in all seats, the midrange sound corresponding to the frequency band such as human singing voice can be heard well from the front, and the high range or low range corresponding to the frequency band such as musical instrument sound, sound effect, or environmental sound. Sounds will be heard better from behind.
Therefore, in all the seats, the sound image localization in all the seats is good because it sounds as if a person is voicing in front while enhancing the sense of presence.

The in-vehicle amplifier device 100 includes a second subtraction circuit 142 and a first attenuation circuit in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111. It may include 151 and a third adder circuit 113.
The second subtraction circuit 142 generates a difference signal between the right side signal of the stereo signal and the left side signal of the stereo signal, and outputs the generated difference signal as the first difference signal.
The first attenuation circuit 151 attenuates the input first difference signal by a predetermined ratio, and outputs the attenuated first difference signal as the second difference signal. The predetermined ratio is, for example, 50%. 50% (percentage) is only an example, and the predetermined ratio may be a ratio larger than 50% or a ratio smaller than 50%.
The third addition circuit 113 adds the input second difference signal to the input first addition signal.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the second subtraction circuit 142, the first attenuation circuit 151, and the third adder circuit 113, the third amplifier 103 has a second difference between the third adder circuit 113 and the third adder circuit 113. It is configured to amplify the first added signal after adding the signals.

The difference signal between the right side signal of the stereo signal and the left side signal of the stereo signal is generally reduced in the midrange corresponding to the frequency band such as a human singing voice, and is used for musical instrument sounds, sound effects, environmental sounds, etc. This is a signal that includes a large amount of treble or bass. Therefore, the sound output from the right rear speaker 13 and the left rear speaker 14 has a high frequency range corresponding to a frequency band such as a musical instrument sound, a sound effect, or an environmental sound, as compared with the sound output from the center speaker 15. Alternatively, the sound has a large proportion of low frequency components.

With this configuration, the sounds output from the right rear speaker 13 and the left rear speaker 14 are the sounds of musical instruments, sound effects, etc., while retaining the frequency components in the midrange corresponding to the frequency band such as human singing voice. Alternatively, the proportion of frequency components in the treble or bass range corresponding to the frequency band such as environmental sound is increased.
Therefore, in all seats, the midrange sound corresponding to the frequency band such as human singing voice can be heard well from the front, and the high range or low range corresponding to the frequency band such as musical instrument sound, sound effect, or environmental sound. The sound will be heard better from behind.
Therefore, in all the seats, the sound image localization in all the seats is good because it sounds as if a person is voicing in front while enhancing the sense of presence.

The in-vehicle amplifier device 100 includes the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, first addition circuit 111, second subtraction circuit 142, first attenuation circuit 151, and first. In addition to the 3 adder circuit 113, a third delay circuit 123 may be provided.
Since the second subtraction circuit 142, the first attenuation circuit 151, and the third adder circuit 113 have been described above, the description thereof will be omitted.
The third delay circuit 123 delays the input second difference signal by a third predetermined period. The third predetermined period is a predetermined period such as 5 milliseconds. 5 ms is only an example, and the third predetermined period may be longer than 5 ms or shorter than 5 ms.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the third delay circuit 123, the third addition circuit 113 delays the input first addition signal by the third delay circuit 123 for a third predetermined period. The second difference signal is added after the second difference signal is added, and the third amplifier 103 is configured to amplify the first added signal after the second difference signal is added by the third adding circuit 113.

With this configuration, the sound output from the right rear speaker 13 and the left rear speaker 14 has a frequency component in the midrange corresponding to a frequency band such as a human singing voice, and the sound, sound effect, or sound of a musical instrument. While leaving the high-frequency or low-frequency components corresponding to the frequency band such as environmental sounds, the high-frequency or low-frequency components corresponding to the frequency bands such as musical instrument sounds, sound effects, or environmental sounds remain as reverberations. Sounds like.
Therefore, in all seats, the singing voice of a person can be heard from the front, the sound of the musical instrument, the sound effect, or the environmental sound can be heard from the rear, and the reverberation of the sound of the musical instrument, the sound effect, or the environmental sound can be heard from the rear. You will be able to hear it.
Therefore, in all the seats, the sound image localization in all the seats is good because it sounds as if a person is voicing in front while enhancing the sense of presence.

The in-vehicle amplifier device 100 includes the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, first addition circuit 111, second subtraction circuit 142, first attenuation circuit 151, and third addition. In addition to the circuit 113 and the third delay circuit 123, a second attenuation circuit 152 and a fourth adder circuit 114 may be provided.
Since the second subtraction circuit 142, the first attenuation circuit 151, the third adder circuit 113, and the third delay circuit 123 have been described above, the description thereof will be omitted.
The second attenuation circuit 152 outputs an attenuated signal obtained by attenuating the input signal by a predetermined ratio. The predetermined ratio is, for example, 50%. 50% (percentage) is only an example, and the predetermined ratio may be a ratio larger than 50% or a ratio smaller than 50%.

The fourth addition circuit 114 adds the second difference signal output by the first attenuation circuit 151 and the attenuation signal output by the second attenuation circuit 152, and uses the added signal as the fourth addition signal for the third delay. Output to circuit 123.
The third delay circuit 123 delays the fourth addition signal output by the fourth addition circuit 114 by a third predetermined period, and outputs the fourth addition signal after the delay as the third delay signal.
That is, the second attenuation circuit 152 attenuates the third delay signal output by the third delay circuit 123 by a predetermined ratio, and outputs the attenuated signal as an attenuation signal to the fourth addition circuit 114.
The reverberation signal of the second difference signal is generated by the third delay circuit 123, the second attenuation circuit 152, and the fourth addition circuit 114.
As shown in FIG. 2, when the in-vehicle amplifier device 100 includes the second attenuation circuit 152 and the fourth adder circuit 114, the third adder circuit 113 has the third delay circuit 123 added to the input first adder signal. The output third delay signal is added, and the third amplifier 103 is configured to amplify the first added signal after the third adder circuit 113 adds the third delay signal.

With this configuration, the sound output from the right rear speaker 13 and the left rear speaker 14 has a frequency component in the midrange corresponding to a frequency band such as a human singing voice, and the sound, sound effect, or sound of a musical instrument. While leaving the high-frequency or low-frequency components corresponding to the frequency band such as environmental sounds, the high-frequency or low-frequency components corresponding to the frequency bands such as musical instrument sounds, sound effects, or environmental sounds remain as reverberations. Sounds like.
Therefore, in all seats, a person's singing voice or the like can be heard from the front, a musical instrument sound, a sound effect, or an environmental sound can be heard from the rear, and a reverberation of the musical instrument sound, a sound effect, or an environmental sound can be heard from the rear. You will be able to hear it.
Therefore, in all the seats, the sound image localization in all the seats is good because it sounds as if a person is voicing in front while enhancing the sense of presence.

As described above, the in-vehicle amplifier device 100 amplifies the right side signal of the stereo signal, and outputs the amplified right side signal as the right side output signal to the right front speaker 11 mounted on the vehicle 1 with the first amplifier 101. , The second amplifier 102 that amplifies the left side signal of the stereo signal and outputs the amplified left side signal as the left side output signal to the left front speaker 12 mounted on the vehicle 1, the right side signal of the stereo signal, and the stereo signal. The first addition circuit 111 that adds the left side signal to generate a monaural signal and outputs the generated monaural signal as the first addition signal, and the first addition circuit after amplification by amplifying the input first addition signal. After the addition signal is used as the first addition output signal, the third amplifier 103 that outputs to the right rear speaker 13 and the left rear speaker 14 mounted on the vehicle 1 and the input first addition signal are amplified and amplified. A fourth amplifier 104 that outputs the first addition signal as the second addition output signal to the center speaker 15 mounted on the vehicle 1 is provided.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, in the in-vehicle amplifier device 100, in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111, the right rear speaker 13 and the left rear speaker A connection line 106 for connecting the 14 to the series is provided, and the third amplifier 103 is configured to be connected in series to the right rear speaker 13 and the left rear speaker 14 via the connection line 106.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, the in-vehicle amplifier device 100 adds the input first addition signal in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first addition circuit 111. The third amplifier 103 includes a first delay circuit 121 that delays the right side signal amplified by the first amplifier 101 or the left side signal amplified by the second amplifier 102 by a first predetermined period, and the third amplifier 103 is a first delay circuit. The 121 is configured to amplify the first addition signal after the delay by the first predetermined period.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, the in-vehicle amplifier device 100 is input in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, first adder circuit 111, and first delay circuit 121. A second delay circuit 122 that delays the first addition signal by a second predetermined period shorter than the first predetermined period with respect to the right side signal amplified by the first amplifier 101 or the left side signal amplified by the second amplifier 102. The third amplifier 103 amplifies the first addition signal after the first delay circuit 121 delays it by the first predetermined period, and the fourth amplifier 104 a second delay circuit 122 only for the second predetermined period. It was configured to amplify the first addition signal after the delay.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, the in-vehicle amplifier device 100 receives the input first addition signal in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first addition circuit 111. The separation circuit 131 that separates the midrange signal to generate a separation signal including a part of the separated midrange signal and outputs the generated separation signal, and the separation input to the input first addition signal. A second addition circuit 112 for adding signals is provided, and the fourth amplifier 104 is configured to amplify the first addition signal after the second addition circuit 112 adds the separation signals.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, the in-vehicle amplifier device 100 receives the input first addition signal in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first addition circuit 111. Of these, the separation circuit 131 that separates the midrange signal, generates a separation signal that includes a part of the separated midrange signal, and outputs the generated separation signal, and the input separation from the input first addition signal. A first subtraction circuit 141 for subtracting a signal is provided, and the third amplifier 103 is configured to amplify the first addition signal after the second addition circuit 112 subtracts the separation signal.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, in the vehicle-mounted amplifier device 100, in addition to the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, and first adder circuit 111, the right side signal of the stereo signal and stereo The second subtraction circuit 142 that generates the difference signal from the left side signal of the signal and outputs the generated difference signal as the first difference signal, and the input first difference signal is attenuated by a predetermined ratio, and after attenuation. A third addition circuit 151 that outputs a first difference signal as a second difference signal and a third addition circuit 113 that adds an input second difference signal to the input first addition signal are provided. The amplifier 103 is configured so that the third adder circuit 113 amplifies the first add-on signal after adding the second difference signal.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, the in-vehicle amplifier device 100 includes the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, first adder circuit 111, second subtraction circuit 142, first attenuation circuit 151, and the above-mentioned first amplifier device 100. , In addition to the third adder circuit 113, a third delay circuit 123 that delays the input second difference signal by a third predetermined period is provided, and the third adder circuit 113 is attached to the input first adder signal. 3 The delay circuit 123 adds the second difference signal after delaying by the third predetermined period, and the third amplifier 103 amplifies the first addition signal after the third addition circuit 113 adds the second difference signal. It was configured to do.
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

Further, the in-vehicle amplifier device 100 includes the above-mentioned first amplifier 101, second amplifier 102, third amplifier 103, fourth amplifier 104, first adder circuit 111, second subtraction circuit 142, first attenuation circuit 151, and first. In addition to the 3 adder circuit 113 and the third delay circuit 123, the second attenuation circuit 152 that outputs an attenuated signal obtained by attenuated the input signal by a predetermined ratio and the second difference output by the first attenuation circuit 151. The third delay circuit 123 includes a fourth addition circuit 114 that adds the signal and the attenuation signal output by the second attenuation circuit 152 and outputs the added signal as a fourth addition signal. The fourth addition signal output by the circuit 114 is delayed by a third predetermined period, and the fourth addition signal after the delay is output as a third delay signal, and the third addition circuit 113 outputs the input first addition signal. The third delay signal output by the third delay circuit 123 is added to the third delay signal, and the third amplifier 103 is configured to amplify the first addition signal after the third addition circuit 113 adds the third delay signal. ..
With this configuration, sound image localization can be improved in all seats in the vehicle 1.

In the present invention, within the scope of the invention, any component of the embodiment can be modified, or any component can be omitted in the embodiment.

1 vehicle, 10 in-vehicle sound system, 11 right front speaker, 12 left front speaker, 13 right rear speaker, 14 left rear speaker, 15 center speaker, 16 playback device, 100 in-vehicle amplifier device, 101 first amplifier, 102 second amplifier , 103 3rd amplifier, 104 4th amplifier, 106 connection line, 111 1st adder circuit, 112 2nd adder circuit, 113 3rd adder circuit, 114 4th adder circuit, 121 1st delay circuit, 122 2nd delay circuit , 123 3rd delay circuit, 131 separation circuit, 141 1st subtraction circuit, 142 2nd subtraction circuit, 151 1st attenuation circuit, 152 2nd attenuation circuit, 171, 172, 173, 174 equalizer.

Claims (9)

A first amplifier that amplifies the right side signal of the stereo signal and outputs the amplified right side signal as the right side output signal to the right front speaker mounted on the vehicle.
A second amplifier that amplifies the left side signal of the stereo signal and outputs the amplified left side signal as a left side output signal to the left front speaker mounted on the vehicle.
A first addition circuit that adds the right side signal of the stereo signal and the left side signal of the stereo signal to generate a monaural signal, and outputs the generated monaural signal as a first addition signal.
A third amplifier that amplifies the input first addition signal and outputs the amplified first addition signal as the first addition output signal to the right rear speaker and the left rear speaker mounted on the vehicle. ,
A fourth amplifier that amplifies the input first addition signal and outputs the amplified first addition signal as a second addition output signal to a center speaker mounted on the vehicle.
An in-vehicle amplifier device characterized by being equipped with. A connection line for connecting the right rear speaker and the left rear speaker in a series is provided.
The vehicle-mounted amplifier device according to claim 1, wherein the third amplifier is serially connected to the right rear speaker and the left rear speaker via the connection line. A first delay circuit for delaying the input first addition signal with respect to the right side signal amplified by the first amplifier or the left side signal amplified by the second amplifier for a first predetermined period is provided.
The vehicle-mounted amplifier device according to claim 1, wherein the third amplifier amplifies the first addition signal after the first delay circuit delays the delay by the first predetermined period. The input first addition signal is delayed by a second predetermined period shorter than the first predetermined period with respect to the right side signal amplified by the first amplifier or the left side signal amplified by the second amplifier. Equipped with a second delay circuit to make
The in-vehicle amplifier device according to claim 3, wherein the fourth amplifier amplifies the first addition signal after the second delay circuit delays the delay by the second predetermined period. A separation circuit that separates the midrange signal from the input first addition signal, generates a separation signal including a part of the separated midrange signal, and outputs the generated separation signal.
A second addition circuit that adds the input separation signal to the input first addition signal, and
With
The vehicle-mounted amplifier device according to claim 1, wherein the fourth amplifier amplifies the first addition signal after the second addition circuit adds the separation signals. A separation circuit that separates the midrange signal from the input first addition signal, generates a separation signal including a part of the separated midrange signal, and outputs the generated separation signal.
A first subtraction circuit that subtracts the input separation signal from the input first addition signal, and
With
The vehicle-mounted amplifier device according to claim 1, wherein the third amplifier amplifies the first addition signal after the first subtraction circuit subtracts the separation signal. A subtraction circuit that generates a difference signal between the right side signal of the stereo signal and the left side signal of the stereo signal and outputs the generated difference signal as a first difference signal.
A first attenuation circuit that attenuates the input first difference signal by a predetermined ratio and outputs the attenuated first difference signal as a second difference signal.
A third adder circuit that adds the input second difference signal to the input first adder signal, and
With
The vehicle-mounted amplifier device according to claim 1, wherein the third amplifier amplifies the first addition signal after the third addition circuit adds the second difference signal. A third delay circuit for delaying the input second difference signal by a third predetermined period is provided.
7. The third adder circuit is characterized in that the second difference signal after the third delay circuit delays by the third predetermined period is added to the input first adder signal. The vehicle-mounted amplifier device described. A second attenuation circuit that outputs an attenuated signal that attenuates the input signal by a predetermined ratio,
A fourth addition circuit that adds the second difference signal output by the first attenuation circuit and the attenuation signal output by the second attenuation circuit and outputs the added signal as a fourth addition signal.
With
The third delay circuit delays the fourth addition signal output by the fourth addition circuit by the third predetermined period, and outputs the fourth addition signal after the delay as a third delay signal.
The vehicle-mounted amplifier device according to claim 8, wherein the third adder circuit adds the third delay signal output by the third delay circuit to the input first adder signal.

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